Manufacture of containers made of paper and similar materials



Aug. 9, 1938. o. KASDORF 2,125,117

MANUFACTURE OF CONTAINERS MADE OF PAPER AND SIMILAR MATERIALS 3Sheets-Sheet 1 Filed July 8, 1937 Aug; 9,1938;

o. KASDORF 5 I 2,126,117

MANUFACTU E Aug. 9, 1938. ,1 o. KASDQRF 2,126,117 MANUFACTURE OF CONTAINERS MADE OF PAPER ANDHSIMILA'R MATERIALS Filed ,July 8, 1937 3 Sl'leets-SIIGGI; 3

Patented Aug. 9, 1938 UNITED STATES PATENT- OFFICE MANUFACTURE OF CONTAINERS MADE OF PAPER, AND SIMILAR MATERIALS Otto Kasdori', Montevideo, Uruguay In Germany May 22, 1936 Application July 8, 1937, Serial No. 152,658

9 Claims.

is to form the closure which is to be folded. An-

other method of making folding creases consists in this, that the container which has already been wrapped and stuck to form a sleeveis introduced with its wall between rotatable folding or embossing members and to'allow it to pass through between these folding members in the peripheral direction. Finally it has been proposed to insert into the prepared container a folding block which only partially fills the interior ofthe container, 15 more particularly its closure part. By laying the container wall against this folding block by means of pressure applying jaws which are brought laterally towards it, not only folds are to be preliminarily pressed but the parts of the Wall to be folded are already to be given a partial preliminary bend, for facilitating the closing of the container, which is effected after the container has been filled. The insertion of the forming block into the container body, the employ merit of a separate folding block for the closure part and the bringing up of a number of pressure applying jaws acting as patrices, which has to be effected in various directions, against the folding block which acts as the matrix, make this method inconvenient, time consuming and expensive. In contradistinction' thereto the invention has for its object to provide an embossing device consisting substantially of a patrix and a matrix, which is suitable for providing contain- 5 ers which have been prepared in a sleeve-like manner with the necessary folding creases or folding edges required for the closure part which is to be folded. This is effected by giving the patrix the form of a plunger, the contours of which correspond substantially to the interior of the unfolded container whilst the matrix is made in the form of a hollow body the inside of the wall of which corresponds to the periphery of the unfolded container.

5 The raised places and the depression on'the The raised places and depressionson the patrix and the matrix may also be formed by surfaces which form an angle with one another and by vmeans' of which the circularor elliptical cross section of the container is transformed into an 5 annular cross section: In doing this it is possible to cause the arcuate container wall to merge 'into the closure part either gradually or with a bounding edge extending preferably in an arcuate fashion. The surfaces on the patrix and matrix which form an angle with one another, may also be jointly used with folding ridges and grooves, so that for instance the convex folds are formed by the edges, where the surfaces abut against each other, whilst the concave folds or folding grooves are produced by means of folding ridges provided on the matrix and corresponding grooves provided on the patrix. Actually sharp folds may be produced at the place where the closure part merges into the container body through the patrix and matrix being formed at the place of transition with somewhat different diameters. The steps thus formed on the patrix and matrix will then produce in the container wall a sharp bend, by means of which, when the container is being closed, the folded in surfaces will be bounded at the bottom and undesired and .irregular sharp bends will be avoided.

The device according to the invention can be made suitable for containers which narrow conically towards the closure part for cylindrical containers and for containers which flare conically towards the closure part. In all these cases the hollow body forming the matrix need not be capable of being taken apart as the embossing operation is effected entirely bythe axial insertion of the patrix. There is of course no reason why the matrix should not be made divisible, for instance for cleaning purposes.

In the accompanying drawings constructional examples of the invention are illustrated.

Figure 1 shows a device for conically narrowing containers in an axial section.

Figure 2 is as to one half a plan view of the empty matrix according to Figure 1, and as to the other half asection through the patrix and the matrix on line II--II of Figure 1.

Figure 3 shows a container stamped by means of the device according to Figures 1 and 2 with the folds formed according to the folding grooves for preparing it for closing.

Figure 4 shows a device for cylindrical containers in axial section.

Figure 5 is a section on V-V of Figure 4.

Figure 6 shows a container stamped by means of the device according to Figures 4 and 5.

Figure 7 shows a device for conically flaring containers in axial section.

Figure 8 is a section on VIII-VIII of Figure 7.

In Figure 9 the folding lines and folding grooves of Figure 7 are replaced by surfaces at an angle with one another. 7

Figure 10 is a section on X--X of Figure 9.

Figure 11 shows in axial section a matrix similar to that of Figure 9 for the production of con vex folding edges by means of surfaces at an angle to one another and of concave folding grooves by means of foldinglines.

Figure 12 is a plan view of Figure 11.

Figure 13 shows the matrix of Figure 11 with.

the patrix inserted in it and the container between them in the stamping position, the patrix being shown in elevation and the matrix and the container in axial section.

Figures 14 and 15 are perspective views of a container provided with folding edges and folding grooves by means of the device according to Figures 11 to 13, before being folded and after the folds have been made corresponding to the folding edges and grooves.

The device according to Figures 1and2 consists substantially of the patrix I and the matrix 2. The patrix is in the form of a truncated cone and may also be used as the mandrel for wrapping the container 3 which narrows conically towards the closure part. The patrix I is provided with four folding ridges two of which are indicated at 6 and 'l' in the right hand part of Fig. 2 and the matrix with four corresponding grooves 4" to 1". The patrix also has two grooves 8' and 9 and the matrix two corresponding folding ridges 8" and 9". On the patrix I with the sleeve 3 placed thereon being inserted into the matrix 2 or, conversely, the matrix 2 being pushed over the patrix I, the folding ridges will be displaced parallel to the associated folding grooves and approached to the latter, until, pressing the container wall between them, they engage a short way one in the other.

folding grooves 4 to I and the concave folding grooves 8, 9, which'howev'er sufi'ice for folding the closure part together by hand or with the aid of suitable closing tools. The lower bounding edges II) to I2 of the folding part thus form themselves. 'Special means may however be provided forforming lower sharp bounding bends for the folding part, which means shall be herein after described.

The arrangement'shown in Figures 4 and.5.

corresponds substantially to that of Figures 1 and 2, but serves for stamping cylindrical containers. The patrix I3 is a substantiallycylindrical body which is offset at I4 so that the lower part has a somewhat smaller diameter. On the offset-part it is provided with longer folding ridges I and shorter folding ridges I6, which project to such an extent as to be fiush with the peripheral part of the cylinder I3, which is not offset. In a corresponding manner the matrix I1 has its lower part offset at the edge I8 so as to project inwardly, this inwardly projecting surface being provided with grooves I9, into which the folding ridges I5 and I6 can be inserted in the longitudinal direction. In order to enable the container with the patrix to be easily withdrawn again out of the matrix, it is preferable for the folding r dges to be formed only on the patrix and for the matrix to be provided only with grooves. In

By this means the container sleeve is provided with slightly convex this way only convex folding'grooves are formed in the container 20, whilst it must have both convex folds 2I and also concave folds 22. This does not matter however, as the convex folding grooves suffice for enabling both the convex folds and the concave folds 22 to be formed. The container 20 and, correspondingly, the patrix I 3 and the matrix I1, are arranged for the production of concertina like folds of the kind known per se. The lower sharp bounding bends 23, 24, 25'of the folded in surfaces either form themselves or special means may be provided for this purpose which shall be hereinafter described. The arrangement according to Figures 7 and 8 corresponds substantially to that of Figures 1 and 2. As however it is intended for containers which flare towards the closure part, the folding ridges, for instance 22, and the grooves, for instance 23, are formed not at the lower, but at the upper end of the patrix 24 and of the matrix 25.

In the arrangement according to Figures 9 and the folding ridges and grooves are re placed by surfaces of the patrix and of the matrix 21, which are arranged at an angle to one another and which abut against one another at the longer edges 28 for the convex folds and at the shorter edges 29 for the concave folds and which merge gradually or at an edge 30 into the conical peripheral surface of the patrix 26. As is shown in the left-hand half of Figure 10, the convex curved peripheral surface of the patrix at first merges into a fiat surface 3I which gradually becomes concave, and then, as shown in the righthand half of Figure 10, merges into two surfaces 32, 33 which join one another inthe edge 29 and are concavely inclined to one another.

In order to enable the patrix 26 with the container 34 to be inserted into the matrix 21, the

diameter d of the patrix 26 at the lower ends of the edges 29 must not be smaller than the diameter (1 of the patrix at the place at which the curved peripheral surface merges into the surfaces which are arranged at an angle to one another.

The patrix 35 and the matrix 36 in Figures 11 to 13 are provided both with surfaces 31 arranged at an angle to one another for forming concave folding edges 38 and with folding edges 39 and as-' sociated folding grooves 40 for forming concave folding edges 3I of the container 42. The surfaces 31 at an angle to one another of the patrix 35 and the corresponding surfaces 33 of the matrix are so formed that with their bounding edges 44' and 44" they stand out slightly beyond the curved peripheral surface of the patrix 35 or form slightly depressed surfaces in the matrix 36. By this means the container 42 (Figures 14 and is given at the lower bounding line slight sharp bends 44 for folding.

The features described in the various constructional examples may also be employed in combination with one another. The number of folding grooves or folding edges to be formed is of course optional, as it depends on the form of the container and on the number of corners, the style and shape of the closure part. When making containers, the body part of which is of rectangular or polygonal cross-section, the folding grooves may be stamped throughout the whole length of the container. Sharp edges at the places of transition in the patrix and matrix should as far as possible be avoided, so that the paper will not be damaged.

What I claim is:--

1. A device for stamping folding grooves and folding edges for the folding closure of containers made of paper and similar materials, comprising a patrix and. a matrix capable of axial motion with respect to one another for applying internal and external pressure to the container blank and provided with raised and depressed places capable of sliding one within the other during the stamp the raised and depressed places of the patrix andthe matrix have the form of surfaces at an angle to one another and capable of displacement parallel to one another.

4. A device as claimed in claim 1 and in which at the raised and depressed places of the patrix and matrix, where the closure part merges into the body part of the container, the said parts form an angle with one another along edges, which edges are capable of being brought towards one another during the relative motion of the patrix and matrix.

5. A device as claimed in claim 1 and in which at the raised and depressed places of the patrix and matrix, where the closure part merges into the body part of the container, the said parts form an angle with one another along arcuate edges, which arcuate edges are capable of being brought towards one another during the relative motion of the patrix and matrix.

6. A device as claimed in claim 1 and in which at the raised and depressed places of the patrix and matrix, which have the form of surfaces at an angle to one another and are capable of displacement parallel to one another, the said parts form where the closure part merges into the body part of the container, an'angle with one another along edges, which edges arecapable of being brought towards one another during the relative motion of the patrix and the matrix.

7. A device asclaimed in claim 1 and in which at the raised and depressed places of the patrix and matrix, which have the form of surfaces it an angle to one another and are capable of displacement parallel to one another, the said parts form where the closure part merges into the body part of the container, an angle with one another along arcuate edges, which arcuate edges are capable of being brought towards one another during the relative motion of the patrix and the matrix.

8. A device as claimed in claim 1 and in which the raised and depressed places of the patrix and the matrix have the form of surfaces at an angle to one another and capable of displacement parallel to one another, thesaid surfaces merging gradually into one another.

9. A device as claimed in claim 1, characterized by the joint use of folding ridges and grooves for longitudinal folding edges and surfaces forming an angle with one another for transverse edges of the folding closure.

O'I'IO KASDORF. 

